[reportlab-users] drive name in the Image relative path in z3c.rml

[Yuan HOng]

Hello,

In the z3c.rml, one can use [module]path to specify a relative image
path to a module path. However, under Windows, sometimes the
module.__file__ returned by python is an absolute path containing the
drive name, like z://path_name. zope.schema.Text.open seems to treat
it as an url and try to open it, causing the following error:

  File "c:\python25\lib\site-packages\reportlab\platypus\doctemplate.py",
line 421, in handle_pageBegin
    self.pageTemplate.onPage(self.canv,self)
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\template.py",
line 146, in drawOnCanvas
    drawing.process()
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\directive.py",
line 108, in process
    self.processSubDirectives()
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\directive.py",
line 101, in processSubDirectives
    directive.process()
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\canvas.py",
line 304, in process
    kwargs = dict(self.getAttributeValues(attrMapping=self.attrMapping))
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\directive.py",
line 58, in getAttributeValues
    value = attr.bind(self).get()
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\attr.py",
line 101, in get
    return self.fromUnicode(value)
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\attr.py",
line 306, in fromUnicode
    fileObj = super(Image, self).fromUnicode(value)
  File "c:\python25\lib\site-packages\z3c.rml-0.5_r74231-py2.5.egg\z3c\rml\attr.py",
line 290, in fromUnicode
    fileObj = self.open(value)
  File "c:\python25\lib\urllib.py", line 82, in urlopen
    return opener.open(url)
  File "c:\python25\lib\urllib.py", line 187, in open
    return self.open_unknown(fullurl, data)
  File "c:\python25\lib\urllib.py", line 199, in open_unknown
    raise IOError, ('url error', 'unknown url type', type)
IOError: [Errno url error] unknown url type: 'z'

I have made the following patch in attempt to fix this:

Index: attr.py
===================================================================
--- attr.py     (revision 76646)
+++ attr.py     (working copy)
@@ -282,6 +282,8 @@
             modulepath, path = result.groups()
             module = __import__(modulepath, {}, {}, (modulepath))
             value = os.path.join(os.path.dirname(module.__file__), path)
+        if os.path.splitdrive(value)[0]:
+            value = 'file:///' + value
         if self.doNotOpen:
             return value
         # Open/Download the file


-- 
Hong Yuan

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